Understanding Uptake of NPK - The Planted Tank Forum
 
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post #1 of 3 (permalink) Old 11-02-2005, 04:00 PM Thread Starter
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Understanding Uptake of NPK

I am working on a bit of a project here.

If we look at uptake of macro nutrients throughout the week. Lets say we express uptake as percentage of dosage. For example: If I dose 100ppm of N in my aquarium and at the end of the week my reading is 70ppm, then we can say that we have 30% uptake.

How does this percentage vary from macro to macro? Are you finding that you have a certain percentage of uptake across NPK, or are you finding that each nutrient has a different percentage?

What is your current uptake percentage in your tank?

The goal of this is to categorize uptake into 3 categories: Low, Medium, High. To accomplish this, please include your percent of uptake and your tank setup.

The outcome of this will be great for all of us when I am finished with my project.

Trust me.

Thanks

jB
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post #2 of 3 (permalink) Old 11-06-2005, 09:12 AM
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Each nutrient's uptake can be different in the same set of light. Sometimes plants do take in excess to store within their leaves.
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post #3 of 3 (permalink) Old 11-06-2005, 03:40 PM
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I found that availability of one nutrient affects uptake of another. For example, I dosed to levels of 10 ppm NO3 and 0.5 ppm PO4. After 3 days, I sometimes found that NO3 had bottomed out, and PO4 was still going strong, and vice versa. Now I know uptake a little better for my tanks, and don't have to test as much.

It will be difficult to measure uptake of K

Sorry for not being more helpful, but I trust that the outcome of your project will greatly enhance our hobby!

(Is it the NPK pill that dissolves over the course of a week?)


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